Theatre Design & Technology - Summer 1991 - 34

swirched "on." The wagon wirh rhe
conran plare is rhen rolled up ro rhe
magner mounred ro rhe plarform. The
magner and rhe plare engage and rhe
joinr becomes secure. When ir is rime ro
shin rhe wagon, rhe elecrromagners are
swirched "off" and rhe joinr is broken.
Two minor problems arose once rhe
magners were insralled and operaring.
We found rhar rhe magners would
vibrare and cause rhe hard surfaces of rhe
plarforms ro resonare if rhey did nor
make solid conran wirh rhe sreel plares.
The sound was subrle, yer discernible in
an inrimare serring. The plares were
removed and Erhafoam padding was
added ro insulare rhe plare from rhe
wood, rhus eliminaring rhe sound.
A second concern was rhar rhe
magners generared enough hear ro
become hor ro rhe rouch. We called rhe
manufacrurer who said rhar rhe hear
build up was normal. The hear generared
did nor discolor rhe wood or cause rhe
painr ro blisrer on me magners.

Electromagnet Stage
Screw and Caster Plate
Anorher applicarion for rhe elecrromagner scenery locks involved rhe
anchoring of a pair of rip jacks ro secure
a wagon (Figure 3). Since rhis job
required more holding power, we
increased rhe magner's holding power by
mounring rwo magners on each bracker.
These paired magners are mounred ro
rhe borrom rail of each ri p jack. Ij,j" sreel
conmcr plares are arrached ro rhe srage
Roor ar rhe unir's exacr playing posirion.
Since anorher wagon covered rhe conracr
plares for rhe orher rwo acrs, rhe plares
are nor a "roe carcher" hazard ro rhe
acrors or crew. However, Roor mounred
conracr plares should be well marked ro
prevenr accidenrs.
The wiring for rhe magners runs pasr
rhe hinge poinr and is connecred ro rhe
power supply mounred on rhe wagon's
casrer plare. Once rhe unir is in place,
rhe srage carpenrer swirches "on" rhe
lock. The elecrromagners anchor rhe
jacks in rheir playing posirions, and rhe
wagon is secured.
The srage crew found rhe wagon
difficulr ro shifr when rhe jacks were
ripped because of rhe size of rhe unir.
The elecrromagners mounred in rhe
borrom of rhe rip jacks again provided
rhe solurion. \'i/e enlarged rhe plares of
rwo 3" swivel casrers by bolring on 2" x
8" xl;:!" flar sreel snips. \'i/hen rhe
magners were disengaged, rhe crew
ripped back rhe jacks and placed rhe
modified casrers under rhe magners
32

1991 SUMMER

TD&T

(Figure 4). Once rhe magners were
reengaged, rhe jacks res red on rhe
magnerically locked casrers and rhe unir
rolled on and off srage wirh ease.

Conclusions
This elecrromagner sysrem offers rhe
porenrial for solving a wide variery of
scenery locking problems for furure
producrions. Borh of rhe applicarions
discussed served rheir respecrive scenic
designs well and made shins much more
manageable. Wirh rheir relarive low cosr,
ease of operarion and abiliry ro be
inrerfaced wirh programmable logic
conrrollers, elecrromagners offer a viable
alrernarive ro rradirional mechanical
locking devices.
fJi

M. Barren Cleveland is technicaL
director and Lighting designer for the
Theatre Program at CoLorado State
University Mark W Shanda is technicaL
director for the Department of Theatre at
The Ohio State University. This project
was funded by a grant Fom CoLorado State
University's CoLlege of Arts, Humanities
and SociaL Sciences ProfessionaL
DeveLopment Program and The Ohio State
University.

TIPS FOR SELECTING AND
USING ELECTROMAGNETS
* Make sure that the
magnet has a continuous
duty cycle.
* Choose the proper
power supply-l 2 VOC or
24 VOC.
* Make sure that the total
wattage of the magnets
does not exceed the rated
wattage of the power
supply (W=VA).
* The contact plate must
meet the magnet squarely
and cover the entire
surface area.
* The larger the contact
plate, the better the
magnet's hold.



Table of Contents for the Digital Edition of Theatre Design & Technology - Summer 1991

Contents
Theatre Design & Technology - Summer 1991 - 1
Theatre Design & Technology - Summer 1991 - 2
Theatre Design & Technology - Summer 1991 - 3
Theatre Design & Technology - Summer 1991 - Contents
Theatre Design & Technology - Summer 1991 - 5
Theatre Design & Technology - Summer 1991 - 6
Theatre Design & Technology - Summer 1991 - 7
Theatre Design & Technology - Summer 1991 - 8
Theatre Design & Technology - Summer 1991 - 9
Theatre Design & Technology - Summer 1991 - 10
Theatre Design & Technology - Summer 1991 - 11
Theatre Design & Technology - Summer 1991 - 12
Theatre Design & Technology - Summer 1991 - 13
Theatre Design & Technology - Summer 1991 - 14
Theatre Design & Technology - Summer 1991 - 15
Theatre Design & Technology - Summer 1991 - 16
Theatre Design & Technology - Summer 1991 - 17
Theatre Design & Technology - Summer 1991 - 18
Theatre Design & Technology - Summer 1991 - 19
Theatre Design & Technology - Summer 1991 - 20
Theatre Design & Technology - Summer 1991 - 21
Theatre Design & Technology - Summer 1991 - 22
Theatre Design & Technology - Summer 1991 - 23
Theatre Design & Technology - Summer 1991 - 24
Theatre Design & Technology - Summer 1991 - 25
Theatre Design & Technology - Summer 1991 - 26
Theatre Design & Technology - Summer 1991 - 27
Theatre Design & Technology - Summer 1991 - 28
Theatre Design & Technology - Summer 1991 - 29
Theatre Design & Technology - Summer 1991 - 30
Theatre Design & Technology - Summer 1991 - 31
Theatre Design & Technology - Summer 1991 - 32
Theatre Design & Technology - Summer 1991 - 33
Theatre Design & Technology - Summer 1991 - 34
Theatre Design & Technology - Summer 1991 - 35
Theatre Design & Technology - Summer 1991 - 36
Theatre Design & Technology - Summer 1991 - 37
Theatre Design & Technology - Summer 1991 - 38
Theatre Design & Technology - Summer 1991 - 39
Theatre Design & Technology - Summer 1991 - 40
Theatre Design & Technology - Summer 1991 - 41
Theatre Design & Technology - Summer 1991 - 42
Theatre Design & Technology - Summer 1991 - 43
Theatre Design & Technology - Summer 1991 - 44
Theatre Design & Technology - Summer 1991 - 45
Theatre Design & Technology - Summer 1991 - 46
Theatre Design & Technology - Summer 1991 - 47
Theatre Design & Technology - Summer 1991 - 48
Theatre Design & Technology - Summer 1991 - 49
Theatre Design & Technology - Summer 1991 - 50
Theatre Design & Technology - Summer 1991 - 51
Theatre Design & Technology - Summer 1991 - 52
Theatre Design & Technology - Summer 1991 - 53
Theatre Design & Technology - Summer 1991 - 54
Theatre Design & Technology - Summer 1991 - 55
Theatre Design & Technology - Summer 1991 - 56
Theatre Design & Technology - Summer 1991 - 57
Theatre Design & Technology - Summer 1991 - 58
Theatre Design & Technology - Summer 1991 - 59
Theatre Design & Technology - Summer 1991 - 60
Theatre Design & Technology - Summer 1991 - 61
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Theatre Design & Technology - Summer 1991 - 66
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Theatre Design & Technology - Summer 1991 - 68
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Theatre Design & Technology - Summer 1991 - 70
Theatre Design & Technology - Summer 1991 - 71
Theatre Design & Technology - Summer 1991 - 72
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